Hardness

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Material surface property as determined from a test such as Rockwell, Brinell, Vickers, etc.

Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards

Resistance of a material to indentation, measured by pressing a hardmetal ball or diamond indenter into a smooth surface under standard conditions.

Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards

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